Originally Posted by thepck

I have a fine carbon powder that I would like to fill into sacks under vacuum. The reason for the vacuum is for efficient air removal and to increase the packed density of the powder. Any suggestions (they don't have to be specifically vacuum bagging)? Thanks.

Your defeating the purpose of the simple use of gravity. The other problem is static electricity.

Carbon dust and vacuum generated static electricity are a deadly combination.

There are three basic bagging methods; open mouth paper bags with previously sewn bottom and then the top is sewn to seal it.

Valve pack bags for bagging bulk product utilising a compressed air blast to blow a measured volume of material into a paper or plastic bag valve pack bag.

The valve pack bag has an integral flap designed to hold the filling nozzle while the bag is being filled with the material as the air blast is pushing the material into the bag. As the valve pack bag is being filled the wieght of the bag is dropping and filling until it is filled and falls away from the filling nozzle.

The bag filling nozzle pops back up right to have the next bag inserted on to the filling nozzle end to start the process again.

the other method is "form, fill, and seal where two plastic rolls are used to form the front a ■

Originally Posted by thepck

I have a fine carbon powder that I would like to fill into sacks under vacuum. The reason for the vacuum is for efficient air removal and to increase the packed density of the powder. Any suggestions (they don't have to be specifically vacuum bagging)? Thanks.

my response was cut off so::::::

the form fill seal method uses electro welding to create the bag sides and bottom and then the bag is filled and then welded shut.

The valve pack method of bagging controls the fugitive dust the best as the entire product is being blown into the bag and the flap seals the bag as the bag falls of the filling nozzle.

heavily grounding the machinery used is a must with explosive dusts of any kind.

the one thing you have not mentioned is the size of the bag so that is a show stopper as a simple bagging line can be used with a bag sewing machine.

trying to use vacuum is not really possible as you will be vacuuming product out and not gaining anything; you should research bagging machinery to narrow your design issues as most likely a valve pack system will be what you will end up with due to the nature of the product unless you use a tippy dump gravity system for the rated bag capacity. ■